Looks like the GOG-Version is delayed a little bit! Why? Isn´t the GOGGalaxy integration final yet? Do you need Offline-Mode first? Why isn´t there any preordering option? I´m not blaming you, but for your own sake you should get the best possible connection to the GOG.com team you could get! Oh, and of course GOGsCommunity are suckers for PA!
I believe it's because of the yet missing offline mode. Hopefully they release it as soon as it's implemented.